1661306356 has 12 divisors (see below), whose sum is σ = 2913210720. Its totient is φ = 828960440.

The previous prime is 1661306341. The next prime is 1661306369. The reversal of 1661306356 is 6536031661.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 420976 + ... + 424903.

It is an arithmetic number, because the mean of its divisors is an integer number (242767560).

Almost surely, 2^1661306356 is an apocalyptic number.

It is an amenable number.

1661306356 is a deficient number, since it is larger than the sum of its proper divisors (1251904364).

1661306356 is a wasteful number, since it uses less digits than its factorization.

1661306356 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 846374 (or 846372 counting only the distinct ones).

The product of its (nonzero) digits is 58320, while the sum is 37.

The square root of 1661306356 is about 40759.1260455864. The cubic root of 1661306356 is about 1184.3586661824.

The spelling of 1661306356 in words is "one billion, six hundred sixty-one million, three hundred six thousand, three hundred fifty-six".